Tucked within the Danish Royal Library in Copenhagen and the Bavarian State Library in Munich, rare medieval manuscripts depict something unusual, even for the Middle Ages—a man and woman fighting in a trial by combat. The man is drawn waist-deep in a hole armed with an edged club, while the woman circulates above, flinging what looks like a rock in a sock. Both are drawn with furrowed brows, fierce snarls, and bloodied limbs. You may have even seen these images pop up on your social media feeds on Reddit or…